Businesses invest in developing products, technology, and manufacturing processes that distinguish them from competitors. Patents can protect qualifying inventions by giving their owners a right to exclude others from specified activities. Patent infringement generally occurs when someone, without authorization, engages in conduct covered by an enforceable patent claim, such as making, using, selling, offering to sell, or importing the patented invention under the conditions established by federal law.
The consequences can extend beyond a single product sale. A dispute may affect product launches, manufacturing arrangements, customer commitments, licensing revenue, and investments in research and development. A business accused of infringement may face demands to stop sales, redesign a product, obtain a license, or pay damages.
For example, a manufacturer may hold a patent claiming a particular valve assembly. A competitor introduces an assembly that operates in a similar way. Whether the competitor infringes depends on the patent’s claims and the accused assembly—not simply whether the products look alike or perform the same general function. The competitor’s independent development of its product does not, by itself, defeat direct infringement.
What Does a Patent Protect?
A patent protects the subject matter defined by its claims. Utility patents generally concern how inventions work or are used, including qualifying machines, processes, manufactured articles, and compositions. Design patents concern qualifying ornamental designs for articles of manufacture and involve a different infringement analysis.
A patent is not a general ownership right over a business idea or an entire field of technology. Nor does obtaining a patent necessarily give its owner permission to make or sell its own product. A product may incorporate technology covered by another party’s patent or remain subject to regulatory requirements.
U.S. patent rights are territorial. Domestic activities, importation, and certain conduct involving foreign manufacture or components are addressed by different statutory provisions. A business should not assume that manufacturing abroad automatically avoids U.S. liability. See 35 U.S.C. § 271.
What Must Be Proven?
1. A Right to Enforce the Patent
The claimant must establish its right to bring the claim. Ownership, assignments, licensing arrangements, and the rights retained by other parties can affect who must participate in the lawsuit.
The patent’s status and the relevant dates also matter. Questions may include whether it had issued, whether it remained in force during the accused activity, and which claims are being asserted. A “patent pending” label does not itself establish the same enforceable rights as an issued patent. Limited pre-issuance royalty rights may exist under separate statutory conditions and should not be assumed.
2. Conduct Covered by an Asserted Patent Claim
For a utility patent, the analysis generally begins by determining the meaning of the asserted claim and comparing its requirements with the accused product or process. Literal infringement requires each claim requirement to be satisfied. Performing the same overall function does not dispense with that comparison.
In appropriate circumstances, the doctrine of equivalents may reach an accused feature that does not literally satisfy particular claim language but is legally equivalent. This doctrine has important limits; it is not a general rule that similar products infringe.
For a process claim, the steps performed and the responsibility for performing them can be critical. Cases involving multiple businesses or users require analysis of whether the conduct is legally attributable as required for the particular infringement theory.
Design patent disputes use a different comparison focused on the claimed ornamental design. The utility-patent analysis should not simply be transferred to a design patent case.
3. An Infringing Act Without Authorization
Direct infringement under the general statutory provision includes unauthorized making, using, offering to sell, or selling the patented invention within the United States, or importing it into the United States, during the patent term. A company need not necessarily manufacture the product itself; selling or using a product can also raise infringement issues.
Direct infringement generally does not require proof that the defendant copied the invention or knew about the patent. Independent development and good intentions therefore do not automatically establish a defense. Knowledge and intent can become important for other liability theories and remedies. See 35 U.S.C. § 271(a).
What Is Indirect Infringement?
A business may face allegations concerning its role in another party’s infringement, rather than only its own direct use of the invention.
Induced infringement concerns actively encouraging infringement, subject to the applicable knowledge and intent requirements. Instructions, marketing materials, or technical assistance may be relevant, but supplying a product is not automatically inducement.
Contributory infringement concerns specified components or materials constituting a material part of the invention, supplied with the required knowledge, that are especially made or adapted for infringement and are not suitable for substantial noninfringing use.
These theories generally require underlying direct infringement and additional proof. They are not interchangeable with direct infringement or with each other. See 35 U.S.C. § 271(b)–(c).
What Defenses and Limitations May Apply?
Noninfringement
The accused product or process may not satisfy the asserted claim. A difference that appears minor commercially may be legally important if it concerns a required claim feature. Conversely, adding features does not necessarily avoid infringement when the required features remain present.
Invalidity
A defendant may challenge whether an asserted claim satisfies the legal requirements for patent protection. Issues may involve earlier patents, publications, products, or other qualifying prior art; whether the claimed invention was obvious; whether it concerns patent-eligible subject matter; or whether the patent adequately describes and defines the invention.
An issued patent is presumed valid, and the party asserting invalidity bears the burden of establishing it. Noninfringement and invalidity are separate defenses: a product may fall outside a valid claim, or a claim covering the product may nevertheless be invalid. See 35 U.S.C. § 282.
Authorization and Other Defenses
A license may authorize the challenged activities, although its scope, duration, and restrictions require review. An authorized sale may also limit patent rights in the particular article under the patent-exhaustion doctrine. That does not create unlimited permission to manufacture new copies of the invention.
Other issues can include expiration, unenforceability, or a specific statutory defense or exception. Ordinary commercial research is not automatically exempt from patent law, and the fact that a business owns its own patent does not establish freedom from infringement.
What Evidence Matters?
Relevant evidence may include the patent and its examination history, ownership and licensing documents, product specifications, source code, manufacturing records, testing results, samples, and technical drawings. Earlier publications and products may be important to an invalidity defense.
Sales records, costs, licensing history, customer demand, and available alternatives can affect damages. Communications concerning the patent, product development, or a demand letter may be relevant to knowledge and intent.
Both sides should preserve relevant records, including earlier product versions and design changes. Confidential technical information may require protective measures when exchanged in litigation. A redesign should be coordinated with evidence preservation rather than accompanied by deletion of the original development record.
Damages and Other Civil Remedies
The available relief depends on the patent, the infringement theory, the evidence, and applicable limitations. Proving infringement does not automatically establish the amount claimed or entitlement to an injunction.
Lost Profits
A patent owner may recover profits it lost because of infringement when the evidence satisfies the applicable requirements. Relevant questions include whether the owner would have made the sales absent infringement, whether acceptable noninfringing alternatives were available, and whether the owner could have supplied the demand.
Gross sales are not the same as lost profits. A decline in revenue does not establish that every loss resulted from infringement, and a patent covering one feature does not automatically support damages based on the entire value of a complex product.
A Reasonable Royalty
Federal law provides compensatory damages of no less than a reasonable royalty for the infringer’s use of the invention, subject to applicable recovery limits. A royalty is compensation for the patented use. Its rate and calculation require evidentiary support, not simply the patent owner’s preferred price.
The analysis must account for the patented contribution rather than automatically assigning the value of unrelated features to the patent. Lost profits and royalties may apply to different portions of the proven infringement, but cannot duplicate compensation for the same loss. See 35 U.S.C. § 284.
Enhanced Damages
A court may increase damages up to three times the amount found or assessed. This means a potential total of three times the underlying amount, not an automatic additional award of three times that amount.
Enhanced damages generally are reserved for egregious misconduct typified by willful infringement. They are not routine compensation for an ordinary infringement finding, and a finding of willfulness does not compel enhancement. The circumstances and the defendant’s conduct matter. See 35 U.S.C. § 284 and Halo Electronics, Inc. v. Pulse Electronics, Inc., 136 S. Ct. 1923 (2016).
Design Patent Profits
Design patents have a separate statutory remedy permitting recovery of total profit on the relevant article of manufacture under the statutory requirements. Identifying the relevant article can be important, especially for a product with multiple components. The remedy should not be assumed to encompass all profits from an entire product in every case.
This design-specific remedy does not create a general right to the infringer’s profits for utility patent infringement. Duplicate recovery of the same profit is prohibited. See 35 U.S.C. § 289.
Injunctions
An injunction is a court order requiring someone to stop or refrain from specified conduct. In a patent case, relief may restrict making, using, importing, or selling an infringing product or practicing an infringing process.
A permanent injunction does not automatically follow a finding of infringement. The patent owner must establish irreparable injury, the inadequacy of monetary remedies, that the balance of hardships warrants relief, and that an injunction would not disserve the public interest. A patent owner’s licensing activity does not automatically disqualify it, just as owning an infringed patent does not automatically entitle it to an order. See eBay Inc. v. MercExchange, L.L.C., 547 U.S. 388 (2006).
Attorney’s Fees, Interest, and Costs
Federal law permits reasonable attorney’s fees to the prevailing party in exceptional cases. A successful defendant may qualify, but winning alone does not establish entitlement. See 35 U.S.C. § 285.
The damages statute also provides for interest and costs as fixed by the court. Recoverable costs do not necessarily include every expense of investigation or litigation. See 35 U.S.C. § 284.
How Do Patent Marking and Notice Affect Damages?
Where the patent-marking statute applies, marking patented articles can provide public notice of the patent. The statute permits specified physical marking or virtual marking that links an article to its patent number through a publicly accessible internet posting.
Failure to comply can restrict damages to infringement occurring after the infringer receives legally sufficient notice and continues infringing. Filing an infringement action constitutes notice under the statute. The applicability of marking requirements depends on the claims, products, and activities involved, including activities of authorized sellers.
Marking is therefore not simply a packaging issue. It can materially affect the period for which damages are recoverable. A patent number somewhere on a website does not necessarily satisfy the virtual-marking requirements. See 35 U.S.C. § 287(a).
What If a Business Receives a Patent Demand Letter?
A demand letter is an allegation, not a court ruling. The recipient should identify the patent owner, the claims being asserted, the accused products or activities, and the basis for the requested payment or license.
An initial evaluation may address noninfringement, validity, ownership, patent status, and potential contractual protections. Supplier agreements may contain defense or indemnification obligations, but those obligations depend on the contract and should not be assumed.
A dispute may be resolved through a license, a legally effective redesign, limits on particular activities, or another negotiated arrangement. Making a cosmetic change or obtaining a separate patent does not necessarily avoid the asserted claims. Knowledge of a patent does not by itself establish entitlement to enhanced damages, but a demand warrants a considered response rather than an assumption that independent development ends the inquiry.
How Far Back Can Damages Be Recovered?
Federal patent law generally bars recovery for infringement committed more than six years before the infringement complaint or counterclaim is filed, unless another rule applies. This is a limitation on recovery for earlier acts, not simply a rule giving every patent owner six years from discovery to bring suit. See 35 U.S.C. § 286.
Marking and notice requirements may shorten the recoverable period further. Patent expiration, licensing terms, and other defenses can also affect relief. Prompt evaluation matters for preserving evidence, assessing ongoing exposure, and determining whether immediate protection is appropriate.
Talk to a Business Litigation Attorney
If another business may be infringing your patent rights, or you are facing allegations that your products, processes, or sales infringe someone else’s patent, contact Waxman Litigation to discuss your options. Early evaluation can help identify the asserted claims, preserve evidence, assess defenses and potential recovery, and determine whether negotiation or litigation best serves your business goals.
This page provides general information only and is not legal advice. Reading it does not create an attorney-client relationship. The applicable requirements, available remedies, and relevant deadlines depend on the patent, the conduct, the facts, and governing law.Businesses invest in developing products, technology, and manufacturing processes that distinguish them from competitors. Patents can protect qualifying inventions by giving their owners a right to exclude others from specified activities. Patent infringement generally occurs when someone, without authorization, engages in conduct covered by an enforceable patent claim, such as making, using, selling, offering to sell, or importing the patented invention under the conditions established by federal law.
The consequences can extend beyond a single product sale. A dispute may affect product launches, manufacturing arrangements, customer commitments, licensing revenue, and investments in research and development. A business accused of infringement may face demands to stop sales, redesign a product, obtain a license, or pay damages.
For example, a manufacturer may hold a patent claiming a particular valve assembly. A competitor introduces an assembly that operates in a similar way. Whether the competitor infringes depends on the patent’s claims and the accused assembly—not simply whether the products look alike or perform the same general function. The competitor’s independent development of its product does not, by itself, defeat direct infringement.
What Does a Patent Protect?
A patent protects the subject matter defined by its claims. Utility patents generally concern how inventions work or are used, including qualifying machines, processes, manufactured articles, and compositions. Design patents concern qualifying ornamental designs for articles of manufacture and involve a different infringement analysis.
A patent is not a general ownership right over a business idea or an entire field of technology. Nor does obtaining a patent necessarily give its owner permission to make or sell its own product. A product may incorporate technology covered by another party’s patent or remain subject to regulatory requirements.
U.S. patent rights are territorial. Domestic activities, importation, and certain conduct involving foreign manufacture or components are addressed by different statutory provisions. A business should not assume that manufacturing abroad automatically avoids U.S. liability. See 35 U.S.C. § 271.
What Must Be Proven?
1. A Right to Enforce the Patent
The claimant must establish its right to bring the claim. Ownership, assignments, licensing arrangements, and the rights retained by other parties can affect who must participate in the lawsuit.
The patent’s status and the relevant dates also matter. Questions may include whether it had issued, whether it remained in force during the accused activity, and which claims are being asserted. A “patent pending” label does not itself establish the same enforceable rights as an issued patent. Limited pre-issuance royalty rights may exist under separate statutory conditions and should not be assumed.
2. Conduct Covered by an Asserted Patent Claim
For a utility patent, the analysis generally begins by determining the meaning of the asserted claim and comparing its requirements with the accused product or process. Literal infringement requires each claim requirement to be satisfied. Performing the same overall function does not dispense with that comparison.
In appropriate circumstances, the doctrine of equivalents may reach an accused feature that does not literally satisfy particular claim language but is legally equivalent. This doctrine has important limits; it is not a general rule that similar products infringe.
For a process claim, the steps performed and the responsibility for performing them can be critical. Cases involving multiple businesses or users require analysis of whether the conduct is legally attributable as required for the particular infringement theory.
Design patent disputes use a different comparison focused on the claimed ornamental design. The utility-patent analysis should not simply be transferred to a design patent case.
3. An Infringing Act Without Authorization
Direct infringement under the general statutory provision includes unauthorized making, using, offering to sell, or selling the patented invention within the United States, or importing it into the United States, during the patent term. A company need not necessarily manufacture the product itself; selling or using a product can also raise infringement issues.
Direct infringement generally does not require proof that the defendant copied the invention or knew about the patent. Independent development and good intentions therefore do not automatically establish a defense. Knowledge and intent can become important for other liability theories and remedies. See 35 U.S.C. § 271(a).
What Is Indirect Infringement?
A business may face allegations concerning its role in another party’s infringement, rather than only its own direct use of the invention.
Induced infringement concerns actively encouraging infringement, subject to the applicable knowledge and intent requirements. Instructions, marketing materials, or technical assistance may be relevant, but supplying a product is not automatically inducement.
Contributory infringement concerns specified components or materials constituting a material part of the invention, supplied with the required knowledge, that are especially made or adapted for infringement and are not suitable for substantial noninfringing use.
These theories generally require underlying direct infringement and additional proof. They are not interchangeable with direct infringement or with each other. See 35 U.S.C. § 271(b)–(c).
What Defenses and Limitations May Apply?
Noninfringement
The accused product or process may not satisfy the asserted claim. A difference that appears minor commercially may be legally important if it concerns a required claim feature. Conversely, adding features does not necessarily avoid infringement when the required features remain present.
Invalidity
A defendant may challenge whether an asserted claim satisfies the legal requirements for patent protection. Issues may involve earlier patents, publications, products, or other qualifying prior art; whether the claimed invention was obvious; whether it concerns patent-eligible subject matter; or whether the patent adequately describes and defines the invention.
An issued patent is presumed valid, and the party asserting invalidity bears the burden of establishing it. Noninfringement and invalidity are separate defenses: a product may fall outside a valid claim, or a claim covering the product may nevertheless be invalid. See 35 U.S.C. § 282.
Authorization and Other Defenses
A license may authorize the challenged activities, although its scope, duration, and restrictions require review. An authorized sale may also limit patent rights in the particular article under the patent-exhaustion doctrine. That does not create unlimited permission to manufacture new copies of the invention.
Other issues can include expiration, unenforceability, or a specific statutory defense or exception. Ordinary commercial research is not automatically exempt from patent law, and the fact that a business owns its own patent does not establish freedom from infringement.
What Evidence Matters?
Relevant evidence may include the patent and its examination history, ownership and licensing documents, product specifications, source code, manufacturing records, testing results, samples, and technical drawings. Earlier publications and products may be important to an invalidity defense.
Sales records, costs, licensing history, customer demand, and available alternatives can affect damages. Communications concerning the patent, product development, or a demand letter may be relevant to knowledge and intent.
Both sides should preserve relevant records, including earlier product versions and design changes. Confidential technical information may require protective measures when exchanged in litigation. A redesign should be coordinated with evidence preservation rather than accompanied by deletion of the original development record.
Damages and Other Civil Remedies
The available relief depends on the patent, the infringement theory, the evidence, and applicable limitations. Proving infringement does not automatically establish the amount claimed or entitlement to an injunction.
Lost Profits
A patent owner may recover profits it lost because of infringement when the evidence satisfies the applicable requirements. Relevant questions include whether the owner would have made the sales absent infringement, whether acceptable noninfringing alternatives were available, and whether the owner could have supplied the demand.
Gross sales are not the same as lost profits. A decline in revenue does not establish that every loss resulted from infringement, and a patent covering one feature does not automatically support damages based on the entire value of a complex product.
A Reasonable Royalty
Federal law provides compensatory damages of no less than a reasonable royalty for the infringer’s use of the invention, subject to applicable recovery limits. A royalty is compensation for the patented use. Its rate and calculation require evidentiary support, not simply the patent owner’s preferred price.
The analysis must account for the patented contribution rather than automatically assigning the value of unrelated features to the patent. Lost profits and royalties may apply to different portions of the proven infringement, but cannot duplicate compensation for the same loss. See 35 U.S.C. § 284.
Enhanced Damages
A court may increase damages up to three times the amount found or assessed. This means a potential total of three times the underlying amount, not an automatic additional award of three times that amount.
Enhanced damages generally are reserved for egregious misconduct typified by willful infringement. They are not routine compensation for an ordinary infringement finding, and a finding of willfulness does not compel enhancement. The circumstances and the defendant’s conduct matter. See 35 U.S.C. § 284 and Halo Electronics, Inc. v. Pulse Electronics, Inc., 136 S. Ct. 1923 (2016).
Design Patent Profits
Design patents have a separate statutory remedy permitting recovery of total profit on the relevant article of manufacture under the statutory requirements. Identifying the relevant article can be important, especially for a product with multiple components. The remedy should not be assumed to encompass all profits from an entire product in every case.
This design-specific remedy does not create a general right to the infringer’s profits for utility patent infringement. Duplicate recovery of the same profit is prohibited. See 35 U.S.C. § 289.
Injunctions
An injunction is a court order requiring someone to stop or refrain from specified conduct. In a patent case, relief may restrict making, using, importing, or selling an infringing product or practicing an infringing process.
A permanent injunction does not automatically follow a finding of infringement. The patent owner must establish irreparable injury, the inadequacy of monetary remedies, that the balance of hardships warrants relief, and that an injunction would not disserve the public interest. A patent owner’s licensing activity does not automatically disqualify it, just as owning an infringed patent does not automatically entitle it to an order. See eBay Inc. v. MercExchange, L.L.C., 547 U.S. 388 (2006).
Attorney’s Fees, Interest, and Costs
Federal law permits reasonable attorney’s fees to the prevailing party in exceptional cases. A successful defendant may qualify, but winning alone does not establish entitlement. See 35 U.S.C. § 285.
The damages statute also provides for interest and costs as fixed by the court. Recoverable costs do not necessarily include every expense of investigation or litigation. See 35 U.S.C. § 284.
How Do Patent Marking and Notice Affect Damages?
Where the patent-marking statute applies, marking patented articles can provide public notice of the patent. The statute permits specified physical marking or virtual marking that links an article to its patent number through a publicly accessible internet posting.
Failure to comply can restrict damages to infringement occurring after the infringer receives legally sufficient notice and continues infringing. Filing an infringement action constitutes notice under the statute. The applicability of marking requirements depends on the claims, products, and activities involved, including activities of authorized sellers.
Marking is therefore not simply a packaging issue. It can materially affect the period for which damages are recoverable. A patent number somewhere on a website does not necessarily satisfy the virtual-marking requirements. See 35 U.S.C. § 287(a).
What If a Business Receives a Patent Demand Letter?
A demand letter is an allegation, not a court ruling. The recipient should identify the patent owner, the claims being asserted, the accused products or activities, and the basis for the requested payment or license.
An initial evaluation may address noninfringement, validity, ownership, patent status, and potential contractual protections. Supplier agreements may contain defense or indemnification obligations, but those obligations depend on the contract and should not be assumed.
A dispute may be resolved through a license, a legally effective redesign, limits on particular activities, or another negotiated arrangement. Making a cosmetic change or obtaining a separate patent does not necessarily avoid the asserted claims. Knowledge of a patent does not by itself establish entitlement to enhanced damages, but a demand warrants a considered response rather than an assumption that independent development ends the inquiry.
How Far Back Can Damages Be Recovered?
Federal patent law generally bars recovery for infringement committed more than six years before the infringement complaint or counterclaim is filed, unless another rule applies. This is a limitation on recovery for earlier acts, not simply a rule giving every patent owner six years from discovery to bring suit. See 35 U.S.C. § 286.
Marking and notice requirements may shorten the recoverable period further. Patent expiration, licensing terms, and other defenses can also affect relief. Prompt evaluation matters for preserving evidence, assessing ongoing exposure, and determining whether immediate protection is appropriate.
Talk to a Business Litigation Attorney
If another business may be infringing your patent rights, or you are facing allegations that your products, processes, or sales infringe someone else’s patent, contact Waxman Litigation to discuss your options. Early evaluation can help identify the asserted claims, preserve evidence, assess defenses and potential recovery, and determine whether negotiation or litigation best serves your business goals.
This page provides general information only and is not legal advice. Reading it does not create an attorney-client relationship. The applicable requirements, available remedies, and relevant deadlines depend on the patent, the conduct, the facts, and governing law.